13721836 has 12 divisors (see below), whose sum is σ = 24117912. Its totient is φ = 6831008.

The previous prime is 13721833. The next prime is 13721837. The reversal of 13721836 is 63812731.

It is a junction number, because it is equal to n+sod(n) for n = 13721798 and 13721807.

It is not an unprimeable number, because it can be changed into a prime (13721833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6430 + ... + 8293.

It is an arithmetic number, because the mean of its divisors is an integer number (2009826).

Almost surely, 2^13721836 is an apocalyptic number.

It is an amenable number.

13721836 is a deficient number, since it is larger than the sum of its proper divisors (10396076).

13721836 is a wasteful number, since it uses less digits than its factorization.

13721836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14960 (or 14958 counting only the distinct ones).

The product of its digits is 6048, while the sum is 31.

The square root of 13721836 is about 3704.2996639041. The cubic root of 13721836 is about 239.4073106837.

The spelling of 13721836 in words is "thirteen million, seven hundred twenty-one thousand, eight hundred thirty-six".